Of Mice and Men is structurally similar to a play. Each of the chapters begins with a detailed description of the setting, and the characters move within the chapter restricted by this setting. Characters come into and go out of the space; the characters who remain hear sounds from without; but the visual scenery does not change once the setting is established.

With that said, you can find descriptions of the bunkhouse, Crooks's room, and the barn respectively at the beginnings of Chapters 2, 4, and 5. I'm not sure based on your question the purpose of finding these descriptions, but you can look specifically for ways that Steinbeck uses light/dark imagery, especially in the barn where the sun is descending and creating a progressively darker atmosphere, mirroring the progressively more horrifying events that occur. The items that are found in the bunkhouse and in Crooks's room can be compared and analyzed for characterization purposes. The men in the bunkhouse focus on fleshly concerns and shallow pleasures, while Crooks is more concerned with mental pursuits.